一、默认关闭自动更新时区

将自动更新时区开关 def_auto_time_zone 的值设置为 false。

文件路径：platform/frameworks/base/packages/SettingsProvider/res/values/defaults.xml

二、自动更新时区打开，设置默认时区不生效问题

当你 persist.sys.timezone 配置了这个没用，那可能和设备驻留到紧急网络上，会根据网络上报的国家码进行匹配并更新时区

2.1 android10.0(Q) 解决办法

frameworks/opt/telephony/src/java/com/android/internal/telephony/NewNitzStateMachine.java

 import java.io.FileDescriptor;
 import java.io.PrintWriter;
 
+//add
+import com.android.internal.telephony.uicc.IccCardApplicationStatus.AppState;
+import com.android.internal.telephony.uicc.UiccCardApplication;
+//end
+
 /**
  * {@hide}
  */
@@ -394,6 +399,12 @@ public final class NewNitzStateMachine implements NitzStateMachine {
         if (DBG) {
             Rlog.d(LOG_TAG, "setAndBroadcastNetworkSetTimeZone: zoneId=" + zoneId);
         }
+        //add
+        UiccCardApplication uiccApp = mPhone.getUiccCardApplication();
+        if (uiccApp == null || uiccApp.getState() == AppState.APPSTATE_UNKNOWN) {
+            Rlog.d(LOG_TAG, "Not to set network time zone due to sim absent");
+            return;
+        }//end
         mTimeServiceHelper.setDeviceTimeZone(zoneId);
         if (DBG) {
             Rlog.d(LOG_TAG,
			 

2.2 android11.0(R) 解决办法

frameworks/opt/telephony/src/java/com/android/internal/telephony/nitz/TimeServiceHelperImpl.java

+import com.android.internal.telephony.GsmCdmaPhone;
+import com.android.internal.telephony.uicc.IccCardApplicationStatus.AppState;
+import com.android.internal.telephony.uicc.UiccCardApplication;


@@ -40,6 +43,7 @@ import java.util.Objects;
 public final class TimeServiceHelperImpl implements TimeServiceHelper {

     private final int mSlotIndex;
+    private Phone mPhone;
     private final TimeDetector mTimeDetector;
     private final TimeZoneDetector mTimeZoneDetector;

@@ -56,6 +60,7 @@ public final class TimeServiceHelperImpl implements TimeServiceHelper {

     public TimeServiceHelperImpl(@NonNull Phone phone) {
         mSlotIndex = phone.getPhoneId();
+        mPhone = phone;
         Context context = Objects.requireNonNull(phone.getContext());
         mTimeDetector = Objects.requireNonNull(context.getSystemService(TimeDetector.class));
         mTimeZoneDetector =

@@ -79,6 +84,11 @@ public final class TimeServiceHelperImpl implements TimeServiceHelper {
     public void maybeSuggestDeviceTimeZone(@NonNull TelephonyTimeZoneSuggestion newSuggestion) {
         Objects.requireNonNull(newSuggestion);
+        UiccCardApplication uiccApp = ((GsmCdmaPhone) mPhone).getUiccCardApplication();
+        if (uiccApp == null || uiccApp.getState() == AppState.APPSTATE_UNKNOWN) {
+            mTimeLog.log("Not to set network time zone due to sim absent.");
+            return;
+        }

         TelephonyTimeZoneSuggestion oldSuggestion = mLastSuggestedTimeZone;
         if (shouldSendNewTimeZoneSuggestion(oldSuggestion, newSuggestion)) {
             mTimeZoneLog.log("Suggesting time zone update: " + newSuggestion);